Casement window



Oct. 5, 1937.- A. LANG 2, 9

CASEME NT WINDOW Filed Sept. 24, 1954 IN VEN TOR.

, '-/0 y i ATTORNEY Patented Qct. 5, 1931 PATENT OFFICE CASEMEN'I' wmnow Albert Lang,

Berkeley, Calif.

Application September 24, 1934, Serial No. 745,225

3 Claims.

This invention relates'to a casement window structure and more particularly to one having a fabricated metal sash and window frame with a mechanical actuating means for controlling the 5 movements of the sash between its opened and closed positions.

An object of the invention is to provide a looking means for the free edge of a sash of the above character which will operate, in conjunction with the sash actuating means at one end of the sash, to draw and hold the free edge of the sash into the frame when the sash is moved into its closed position by said actuating means. Another object of the invention is to provide a locking means for a fabricated metal sash of the out-swinging type which will be concealed from view when the sash is in its closed position. When sashes of the character contemplated by this invention are made of iron they must, in order to reduce the total weight thereof, be fabricated with structural iron sectionsof special design. Therefore, the frame and sash are usually made of structural iron having a modified 2 cross section. Structural iron of such a cross section provides a very rigid sash and frame where the window is of a small size but, where the size of the window is increased beyond a definite limit the sash becomes flimsy and has a tendency to become distorted and sometimes sags so that the free edge and top thereof cannot be drawn into tight antirattling engagement with the frame at these points by the forces applied, at the bottom of the sash, by the actuator. In the past it has been the practice to provide an additional lock or latching means, which is operated independently of the actuator, for tightly closing the sash upon the frame in a satisfactory manner. However, when an inside screen is used with such an out-swinging sash it is difficult, if not impossible, to mount a separate latch or locking means upon the sash so that it can be operated without removing the screen. It is, therefore, a further object of the present invention to provide a latching means which will cooperate with the sash actuator to draw and lock the sash snugly within the frame, at a point remote from the sash actuator, in response to forces exerted upon the sash by the actuator.

With the above and other objects in view, the invention resides in the construction, combination and arrangement of parts substantially as will be hereinafter described and more particularly defined by the appended claims.

For a better understanding of the invention 6 reference should be had to the accompanying drawing wherein there is shown, by way of illustration and not of limitation, a preferred embodiment thereof.

In the drawing:

Figure 1 is a perspective view of a frame and sash assembly of the type contemplated by this invention,

Figure 2 is a fragmentary vertical sectional view with parts broken away to show the details of construction, Figure 3 is an enlarged fragmentary view, with the sash nearly closed, looking toward the inside of the frame, as indicated by arrow A in Figure 1, with parts broken away to disclose the details of construction, and I Figures 4 and 5 are fragmentary views of a modified detail of the invention.

In the drawing the numeral l0 designates a casement window frame and the numeral H designates an out-swinging sash which is hinged upon the frame it by means of outwardly disposed hinge forming brackets I2. The window frame l0 and the sash' H are constructed of rolled structural iron having a substantially Z- shaped cross section and the frame ismade slightly larger than the sash so that the latter will nest snugly within the frame.- A sufficient clearance is provided between the frame In and the sash II to accommodate a sash actuating means and a locking means of the type contemplated by this invention when the sash is in its I closed position.

'The sash ii is adapted to be moved into its opened and closed positions by means of an actuotor l3 which in the present instance is shown, for the purpose ofillustrating one type, as comprising a pivoted arm it having a rack sector l5 which is engaged by a worm gear (not shown) that is controlled by an operating crank it.

The outer end of the arm l4 slidably engages a suitable recess extending along the bottom of the sash I I and when the crank I6 is turned the sash I I will be moved by thearm M as it pivots in response to forces applied to its rack sector l5, by the worm gear of the actuator [3, when the operating crank it is turned.

The embodiment of the present invention which has been chosen for the purpose of illustration comprises a locking bar II that is slidably mounted upon the web of the Z-shaped section forming the free edge of the sash I l. The looking bar H has a slot l8 at its top and bottom ends through which a screw 19 passes. Intermediate the ends of the locking bar I! there is an additional slot 20 with an adjustable pin 2| disposed therein for properly positioning the locking bar I! upon the sash II and limiting its downward movement. At its upper end the locking bar ll has an oflset extension 22 that is adapted to engage an abutment or keeper 23 which is secured upon the inner cheek of the window frame ill and at its lower end the locking bar I! has an anti-friction roller 24.

The screws i9 are so positioned upon the sash II that they will support the locking bar IT with the roller 24 extending slightly below the sash I when the latter is out of engagement with the frame Ill. This will permit the locking bar I! to be moved upwardly, when the roller 24 engages an inclined surface or stationary cam 25 carried by the frame III, and bring the offset extension 22 thereof into interlocking engagement with the abutment or keeper 23 carried by the frame I0.

As shown in Figure 2 of the drawing, the offset extension 22 and the keeper 23 have inclined surfaces which will cooperate, during the final closing movement of the sash II, to draw the free edge of the sash into close engagement with the frame III at a point remote from the actuator l3. In practice, it is desirable to provide a maximum of clearance between the lower end of the keeper 23 and the upper end of the offset extension 22 so that there will be no danger of interference between these parts, before the roller 24 comes into its operative position upon the inclined surface 25 at the bottom of the frame l0. However, because of the limited movement of the sash II with respect to the frame I during the final closing operation, this clearance cannot be excessive. To regulate the clearance and properly position the abutment or keeper 23 with respect to the inclined surface25 at the bottom of the frame iii, the abutment or keeper 23 is adjustably secured upon the cheek of the frame |0 by means of screws 26.

As shown in Figure 3 of the drawing, the inclined surface 25 is made comparatively steep at its initial roller engaging end. This will cause the roller 24 to raise rapidly and move the looking bar l upwardly to take up the clearance and,

bring the inclined surface upon the offset extension 22 into cooperating relation with the inclined surface upon the abutment or keeper 23 before the sash II is fully closed. At this point the remaining portion of the inclined surface 25, which is disposed at a considerably less inclined angle, will offer very little resistance to the final closing of the sash H by the actuator I3. The angle of inclination of this latter portion of the surface 25 is such that it will, with little effort, when the keeper 23 is properly positioned, forcefully move the locking bar I'I upwardly a sufficient distance to produce a wedging action between the cooperating inclined surfaces upon the offset extension 22 and the keeper 23 and draw the free edge of the sash tightly into the frame III as the actuator l3 draws the bottom of the sash into the frame III.

In Figures 4 and 5 of the drawing, there is shown a modified arrangement of the invention wherein a locking bar 21 is adapted to be operated by a bell crank which is mounted upon a pivot 23 at the lower part of the sash I As here shown, the bell crank has a relatively long downwardly projecting arm 29 and a short arm 30. The long arm 29 of the bell crank has an inwardly extending end 3| which is adapted to engage the frame before the sash reaches its final the locking bar 21. This arrangement, with a bell crank having a long arm 29 and a short arm 30, asdescribed above, provides for an increase in leverage which will produce a forceful wedging action between the locking bar 21 and its cooperating abutment without producing a corresponding resistance to a final closing of the sash II by the actuator I3.

, The operation of a sash constructed in accordance with this invention, in so far as the opening and closing movements thereof are concerned, should be evident from the above. However, in order that there will be no misunderstanding as to the final closing and locking operation of the locking bar l1, it may be said that when the bottom of the sash H is moved by the actuator l3 into a position approaching its final closed position the roller 24 will engage the in clined surface 25. This will cause the locking bar |1 to move upwardly and, when the keeper 23 is properly adjusted with respect to the inclined surface 25, bring the cooperating inclined surfaces upon the offset extension 22 of the locking bar I! and upon the keeper 23 into engagement so as to produce a wedging action which will draw the sash inwardly at this point and lock it firmly in the frame Hi. The operation of the modified form of the invention shown in Figures 4 and 5 of the drawing is similar to the above except that, instead of the roller 24, there is the extension 3| upon the long arm 29 of the bell crankiwhich engages the frame ID. The extension 3| projects inwardly from the sash a sufficient distance to engage the frame i9 before the sash II has completed its closing movement. This causes the bell crank to rotate upon its pivot 29 and lift the locking bar 2l\upwardly to produce the wedging and locking action above described.

When the sash i has been closed and locked in the above manner, it will be held firmly and tightly closed upon theframe l9 until the actuator I3 is operated to move the sash H from its closed position. Upon a sash opening operation of the actuator l3, the bottom of the sash II will be moved outwardly and as a result the roller 24 will move downwardly over the inclined surface 25 and permit the cooperating surfaces upon the offset extension 22 and the keeper 23 to disengage. The sash II can then be fully or partially opened by the actuator l3.

There may be instances where it will not be feasible, because of climatic conditions, to mount the locking bar upon the sash In such instances the parts, which comprise the locking bar H, the keeper 23 and the inclined surface 25 and their accessories, can be reversed in position upon the window sash and frame. Under these conditions'the locking bar will be mounted in a reversed position upon the frame i0 and the keeper 23 and the inclined surface 25 will be mounted upon the sash In this arrangement the roller 24, upon the lower end of the locking bar II, will be raised as the bottom of the sash II) with the inclined surface 25, now carried at the bottom of the sash, is drawn in under the roller 24 by a sash closing operation of the actuator 3. This will bring the inclined surfaces upon the offset extension 22 and upon the keeper 23 into cooperating relation and lock the sash H in the manner above described.

By way of illustration, I have shown the looking bar I! as a flat slidable bar, but it is to be understood that this bar may take other forms.

For instance, it may be a round rod having offset ends which will properly engage abutments upon the frame and sash and rotate in its operation to draw in and lock the sash as contemplated by this invention.

While I have, for the sake of clearness and in order to disclose my invention so that the same can be readily understood, described and illustrated specific devices and arrangements, I desire to have it understood that this invention is not limited to the specific means disclosed, but may be embodied in other ways that will suggest themselves to persons skilled in the art. It is believed that this invention is new and it is desired to claim it so that all such changes as come within the scope of the appended claims are to be considered as part of this invention.

Having thus described my invention my invention, what I claim and desire to secure by Letters Patent is- 1. In a casement window structure, the combination of a skeleton frame of metal having hinges at one side thereof, a sash formed of metal having a channel cross section mounted upon said hinges and swingable with respect to said frame, an adjustable keeper upon said frame in the sash opening and disposed opposite the hinges carried thereby, said keeper having an outwardly and downwardly inclined detent receiving surface, a slidably mounted bar disposed along the free edge of said sash and in the channel thereof having an inwardly and upwardly inclined detent forming surface at its upper end adapted to engage said keeper, means forming an outwardly and downwardly inclined surface upon said metal frame disposed in line with the bar upon the free edge of the sash, the surface upon said means having two inclinations, the first of which is at a slight angle from vertical and the second of which is at a slight angle from horizontal, a roller disposed in an inward position upon the lower end of said bar adapted to engage the inclined surface upon said frame and move said bar so as to cause the detent forming surface at the upper end of said bar to engage in wedging relation with the inclined surface upon said adjustable keeper during the final operation of the sash, and means for vertically adjusting the position of said keeper upon said frame.

2. In a casement window structure, the combi nation of a skeleton frame of metal having hinges at one side thereof, a sash formed of metal having a channel cross section around its outer boundary mounted upon said hinges and swingable with respect to said frame, a keeper upon said frame disposed in the sash frame opening opposite the hinges carried thereby, a slidably mounted locking bar extending along and carried by the free edge of said sash, said slidable mounted locking bar having a keeper engaging end adapted to cooperate with said keeper, a lock-, ing bar engaging member mounted upon the sash frame below said keeper having a double inclined surface projecting into the sash opening of said frame where the lower end of said slidably mounted locking bar will engage same, the double inclined surface of said locking bar engaging member being adapted to first move said slidable locking bar a substantial part of its movement to bring its keeper engaging end into interlocking relation with the keeper upon said frame and during the final closing operation of the sash to move said slidable locking bar the remainder of its movable distance to effect a final locking of the sash upon said frame.

3. In a casement window structure, the combination of a skeleton frame of metal having hinges at one side thereof, a sash formed of metal mounted upon said hinges and swingable with respect to said frame, a keeper carried by said frame disposed in the sash opening opposite the hinges carried thereby, a locking bar carried by and slidably mounted upon the free edge of said sash, said slidable sash locking bar having means at its upper end adapted to engage said keeper, a locking bar operating member secured upon said frame below said keeper having an outwardly projecting double inclined surface projecting into the sash opening upon said frame and disposed in the path of the lower end of said locking bar, the outermost incline of said double inclined surface being relatively steep with respect to the horizontal and the innermost incline thereof being less steep, and means upon the lower end of said locking bar adapted to engage the inclined surfaces upon said operating member, whereby said locking bar will be first moved a major distance to bring its keeper engaging end into interlocking relation with said keeper and during the final closing operation of the sash to be moved a minor distance into full sash locking relation with said keeper.

ALBERT LANG. 

